As you might notice reiser4 is not part of the kernel (and unless there's an official patch this won't change for the upcoming grml-release). The external modules lufs, nozomi, thinkpad and vaiostat don't compile against 2.6.18 yet, the rest of the work has been done. I'm already running grml 0.8-3d with this kernel version. A new develrelease will be available within the next few days...